This was a known thing with much of the 10mhz v20's. A factory tweak to get them to clock reliably at 10mhz it seems. The very tale end of them did not have this issue.

@@wishusknight3009 Thanx for confirming what I had guessed was the problem!

I've got a 10 MHz V30 I'm going to add an SCSI CDROM to, as well as a Radlib soon on my channel :D It's got Windows 2.03 on it.

@@the_kombinator That will be a flyin machine!

@@wishusknight3009 Yeah I was amazed that it pretty much booted up and ran after sitting for 10+ years. The hard disk took some coaxing but it works with no bad sectors, and tons of programs already on it. Had to do some fiddling to make the ATI Edge VGA video card to work with Windows (it had a Hercules card in there originally) but yeah, after my multiple 486 projects, that one is next :D JUKO NEST board too :D

The occasional ‘jaa’ is also oddly satisfying 🙂

I like the Welcome to my "chandler" introduction. It's a very nice (and funny) accent to hear. Your channel would definitely not be the same without it. :)

das macht spaß another austrian here

English is a Germanic language, it fits German phrasing well, although English vocabulary is mainly from romance languages, Latin and French, especially.

SimCity is one of the only games, and even one of just a few applications, that will utilize a 8087 math co-processor. Window 3.1 needed a 386. Are you sure it wasn't Windows 3.0? Or maybe the 286 had an upgrade, either an Intel Inboard or similar?

@@squirlmy Windows 3.1 would run on a 286 with 1Mb RAM.. trust me, I ran windows 3.1 on a 286 12mhz and my mate also owned a 286 at the time and ran windows 3.1 on his 286 back in the 90s as well. Search KZfaq for windows 3.1 on 286 there is a number of videos of it running on 286s with at least 1mb RAM.. system requirements were 286 minimum 386 recommended

I was going to add a comment to this as he was talking.. heh! I'll continue your comment because (First!!1 respect etc). If you are a CP/M fan you probably already know this. It was called "8080 Mode Shifting" when you call a BRKEM instruction. :) I run two in my NuXT board and a NCR PC4i.

And there was another CPU later on that was compatible with both 8088 and Z80 code.

@@AmaroqStarwind The V30 also compatible with Windows 3.0

@@asanjuas So was the 8088. Windows "real" mode. It required 640k though as far as I know.

The 8086 was kind of source compatible to the 8080 in a round about sort of way, but did require some tweaking and recompiling. It certainly was not directly source or binary compatible by any stretch. It was only designed in such a way that 8080 assmenbly could be ported easily up to an 8086 without a full rewrite. It was fascinating that the V20 was indeed mostly compatible.

Heck yeah! (And let's see them completely destroy the 8088 MPH demo... In both a good way, and a bad way, due to it being timing-sensitive.)

Those are a rare creature to find now. The v30 was intended to compete with the 80186.

I seem to remember a PC compatible card for the Apple II series of computers used a V30. The advertisements stated it ran 3X faster than an XT. The card I believe was called the PC Transporter from Applied Engineering.

@@lemonherb1 Yeah I remember this as well. I can not remember if it used a V30 or V20 however. I thought it was a V20 myself.... Holdon let me do a quick search...... Huh... it is a v30... I'll be dazzle drawn... PC Transporter with 768K $679 Specifications: CPU: High performance true 16 bit V-30 microprocessor; chip has full 8086 and 8088 instruction set operat-ing at 7.16 MHz User RAM: 640K maximum (IBM) System RAM: 128K Apple User RAM: 768K maximum.

i think v33a is more interesting but not sure if pc compatible motherboards using v33a exists...

Thank you very much! Its just my passion and I am happy that there are people with the dame interests out there. cheers from Austria 🇦🇹

I'd say it's too beautiful to throw away!

Quite a few chips were available in white ceramic with gold pins back in those days.

@@sbalogh53 I had a look on ebay, I might buy myself one, they do look so much better.

I guess you mean a 10 MB drive and not GB 😉.

@@CPUGalaxy exactly correct! . See how old I am.. Lol.

Several poor design decisions caused performance limitations on the 8088 and the subsequent V20. The first is the crippled 8 bit bus, but exacerbating that is the fact the data bus and part of the address bus are multiplexed on top of each other. Additionally some other lines are multiplexed on the upper address bus, so a lot of glue logic, wait states and extra bus cycles are needed to get information in and out of the CPU. Slow memory of the time was an issue, but the multiplexing and 8 bit bus were the worst problems that prevented the 8088 from performing better, and the subsequent V20. The V20 could be as efficient as it wanted to be, but it was burdened with so much baggage that any improvements were always going to be minimal. The 8086 wasn't much better because Intel still multiplexed the address and data bus. It wasn't until the 80286 that Intel stopped multiplexing the address and data buses, but it really should have never existed, along with the 8018x. The 80386DX was what the previous chips should have been.

V20 upgrade was extremely cheap, pizza money cheap. There was another upgrade in 386 times with Cyrix 486DLC chips that promised stars, but delivered Doom at 10-12fps at the cost of half the full 486 upgrade :(

Thank you. The NEC v30 is a 16 bit version and not pin compatible. So I could not test it in the same setup.

@@CPUGalaxy aaah yes. So you could compare it to the 8086 then?

Nice story brother

I remember there had been a 25MHz 286 in the early 90's. Don't know what brand it was though.

They did. You could buy 286 and later even 386SX upgrades in a form of ISA card with own memory slots. You couldnt plug any upgrades directly into CPU slot because it was very limited (multiplexing). ISA cards had own memory making them fast when doing calculations, they were only limited by the ISA interface speed when accessing external peripherals.

Hi, even with very early machines you can get conflicts, but often in these systems there is a small quantity of add on cards used Video often runs on its own as does a multi I/O card The first conflicts come with sound cards that clash with another card , typically on ST a date / clock card Once you add a modem and you have 2 serial ports then that is when the first conflicts start, adding sound and network just build up the issues. Very early ISA card are actually good as they have instruction on the physical pin connectors to the jumpers on them that hard wires the IRQ or memory address ( sound and lan ) so it is basically just some planning up front I find the main drama is advanced sound cards that use 2 or 3 irq's due to each sound mode having its own unique interrupt adlib / sb16 / midi - your machine can have this card, but if it has a modem and lan card or scsi then you have to juggle IRQ's Dos 5 solved a lot of these issues by being able to reserve memory address for specific hardware eg a SMC lan card can use c0000 or c4000 memory location and you exclude that in the config sys, this makes a memory hole at that spot that software cannot use but preset hardware can, same with sound cards But you are correct only 1 device to each IRQ, PS2 AT's and later had a few extra irq's that XT/AT does not have , IRQ 9 was modified at the same time to jump to another set of new irq's, so by 386's the sequence was 1, 2 redirects to 9 , 3,4,5,6,7,8,9 then 9redirections lets call them 9A 9B 9C 9d, then 10,11,12,13,14

This is called a feature connector to overlay an image as used for instance with mpeg decoder cards or TV tuner cards.

😅

I found the V20 Bios : www.tiffe.de/robotron/misc/V20-Bios/

I wished I still had my 8088 XT. I even had an original IBM PC XT with original CGA monitor but I threw them all out years ago 😭😭😭. I also miss my 286 12MHz as I loved running Windows 3.1 on it along with Wolfenstein 3D.. I also miss using GEOS on my original breadbin C64 - so many classic computers and great early GUI operating systems that I threw out decades ago 😭

Yea soo sad :( I do not have my first 2 PCs too :( I have 20-30 Retro PCs now to compensate for that XD But still :(

@@mrbrad4637 okay pc/geos is more faster than the shit of win3.1